Miami pedestrian bridge collapse

[CADplans]

I remember watching a show detailing the building of sections of the Chesapeake Bay Bridge–Tunnel "bridge" being built in 1960 using this technique.
so, tensioned concrete is at least 60 years old,,,

Chesapeake Bay Bridge–Tunnel - Wikipedia

 

[California]

Juan Browne's videos on the Oroville Dam Spillway collapse and repair are excellent, the best descriptions I've seen. (My home in town is an hour downstream so I followed those intently. )

Browne's video today is equally excellent. It will be interesting to follow his narratives. The guy is a genius, a renaissance man with wide interests.

The tensioning rod that seems to have popped out of the top of a chord along with its hydraulic tensioning machine, can be seen in one of his pictures.

Pipeliner over on WW posted the following video. It is a slow motion version of the Miami Herald video I linked yesterday. This time the location where the bridge first broke is more obvious.

 

[Stimw]

Looked like the workers harness failed as he was falling.

Stay tuned, they are still analyzing the Titanic and the World Trade Center.

 

[bigdeano]

Watching the surveillance video they showed on tv, it looks like the diagonal member at the north end failed in compression right near the top. I wonder how long they let the concrete cure. Pretty dumb letting traffic underneath until it was stabilized.

 

[Streetcar]

Watching the surveillance video they showed on tv, it looks like the diagonal member at the north end failed in compression right near the top. I wonder how long they let the concrete cure. Pretty dumb letting traffic underneath until it was stabilized.

The diagonals were designed as stiffener not structural member, the diagonal broke as result of the structural failure.The bridge was a post tensioned beam

 

[crazyal]

Kind of odd that the point where the bridge let go was also where a crane was set up and a manlift was located.

 

[houstonscott]

I wonder were in China the steal came from...

 

[MossRoad]

I wonder were in China the steal came from...

Where vs Were vs Wear...
Where vs. Were vs. Wear: What’s the Difference? - Writing Explained

 

[Mace Canute]

This might be of interest to some of you.

https://facilities.fiu.edu/projects/BT_904/MCM_FIGG_Proposal_for_FIU_Pedestrian_Bridge_9-30-2015.pdf

 

[MossRoad]

Juan Browne's videos on the Oroville Dam Spillway collapse and repair are excellent, the best descriptions I've seen. (My home in town is an hour downstream so I followed those intently. )

Browne's video today is equally excellent. It will be interesting to follow his narratives. The guy is a genius, a renaissance man with wide interests.

The tensioning rod that seems to have popped out of the top of a chord along with its hydraulic tensioning machine, can be seen in one of his pictures.

Pipeliner over on WW posted the following video. It is a slow motion version of the Miami Herald video I linked yesterday. This time the location where the bridge first broke is more obvious.

Not failure related.... but did anyone else notice that almost to a T, as soon as it happened, everyone left their cars and trucks and ran TOWARDS the disaster, most likely wanting to help. Puts a little faith back in humanity.